Threading in section

Anupam_Dev — Sat, 01 May 2010 14:30:31 GMT

#include
#include
#include

void display1()
{
#pragma omp parallel for num_threads(5)

for(int i=0;i<10;i++)
printf("From display1 %d\\n\\n",omp_get_thread_num());

}

void display2()
{
printf("From display2 %d\\n\\n",omp_get_thread_num());
}
int main()
{

#pragma omp parallel sections
{
#pragma omp section
display1();
#pragma omp section
display2();
}
getch();
}

I got the result

From display1 0

From display2 1

From display1 0

From display1 0

From display1 0

From display1 0

From display1 0

From display1 0

From display1 0

From display1 0

From display1 0

Now i wanted to know that when i parallelized for in the function display1 why are all the omp_get_thread_num() in that section 0.

If it is not possible this way then how can we do this. I want to parallelize the sections as well as a part of a particular section.

Threading in section

jimdempseyatthecove — Sun, 02 May 2010 12:45:37 GMT

You must enable nested parallelism

int main()
{
omp_set_nested(1); // 0=no nesting, (non zero)=enable nesting
#pragma omp parallel sections
{
#pragma omp section
display1();
#pragma omp section
display2();
}
getch();
}

You can also enable nesting by use of environment variable

set OMP_NESTED=TRUE

Jim Dempsey

topic Threading in section in Intel® Moderncode for Parallel Architectures

Threading in section

Threading in section